/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.action.admin.cluster.node.stats;

import org.opensearch.action.FailedNodeException;
import org.opensearch.action.support.ActionFilters;
import org.opensearch.action.support.nodes.BaseNodeRequest;
import org.opensearch.action.support.nodes.TransportNodesAction;
import org.opensearch.cluster.service.ClusterService;
import org.opensearch.common.inject.Inject;
import org.opensearch.common.io.stream.StreamInput;
import org.opensearch.common.io.stream.StreamOutput;
import org.opensearch.node.NodeService;
import org.opensearch.threadpool.ThreadPool;
import org.opensearch.transport.TransportService;

import java.io.IOException;
import java.util.List;
import java.util.Set;

/**
 * Transport action for obtaining OpenSearch Node Stats
 *
 * @opensearch.internal
 */
public class TransportNodesStatsAction extends TransportNodesAction<
    NodesStatsRequest,
    NodesStatsResponse,
    TransportNodesStatsAction.NodeStatsRequest,
    NodeStats> {

    private final NodeService nodeService;

    @Inject
    public TransportNodesStatsAction(
        ThreadPool threadPool,
        ClusterService clusterService,
        TransportService transportService,
        NodeService nodeService,
        ActionFilters actionFilters
    ) {
        super(
            NodesStatsAction.NAME,
            threadPool,
            clusterService,
            transportService,
            actionFilters,
            NodesStatsRequest::new,
            NodeStatsRequest::new,
            ThreadPool.Names.MANAGEMENT,
            NodeStats.class
        );
        this.nodeService = nodeService;
    }

    @Override
    protected NodesStatsResponse newResponse(NodesStatsRequest request, List<NodeStats> responses, List<FailedNodeException> failures) {
        return new NodesStatsResponse(clusterService.getClusterName(), responses, failures);
    }

    @Override
    protected NodeStatsRequest newNodeRequest(NodesStatsRequest request) {
        return new NodeStatsRequest(request);
    }

    @Override
    protected NodeStats newNodeResponse(StreamInput in) throws IOException {
        return new NodeStats(in);
    }

    @Override
    protected NodeStats nodeOperation(NodeStatsRequest nodeStatsRequest) {
        NodesStatsRequest request = nodeStatsRequest.request;
        Set<String> metrics = request.requestedMetrics();
        return nodeService.stats(
            request.indices(),
            NodesStatsRequest.Metric.OS.containedIn(metrics),
            NodesStatsRequest.Metric.PROCESS.containedIn(metrics),
            NodesStatsRequest.Metric.JVM.containedIn(metrics),
            NodesStatsRequest.Metric.THREAD_POOL.containedIn(metrics),
            NodesStatsRequest.Metric.FS.containedIn(metrics),
            NodesStatsRequest.Metric.TRANSPORT.containedIn(metrics),
            NodesStatsRequest.Metric.HTTP.containedIn(metrics),
            NodesStatsRequest.Metric.BREAKER.containedIn(metrics),
            NodesStatsRequest.Metric.SCRIPT.containedIn(metrics),
            NodesStatsRequest.Metric.DISCOVERY.containedIn(metrics),
            NodesStatsRequest.Metric.INGEST.containedIn(metrics),
            NodesStatsRequest.Metric.ADAPTIVE_SELECTION.containedIn(metrics),
            NodesStatsRequest.Metric.SCRIPT_CACHE.containedIn(metrics),
            NodesStatsRequest.Metric.INDEXING_PRESSURE.containedIn(metrics),
            NodesStatsRequest.Metric.SHARD_INDEXING_PRESSURE.containedIn(metrics),
            NodesStatsRequest.Metric.SEARCH_BACKPRESSURE.containedIn(metrics)
        );
    }

    /**
     * Inner Node Stats Request
     *
     * @opensearch.internal
     */
    public static class NodeStatsRequest extends BaseNodeRequest {

        NodesStatsRequest request;

        public NodeStatsRequest(StreamInput in) throws IOException {
            super(in);
            request = new NodesStatsRequest(in);
        }

        NodeStatsRequest(NodesStatsRequest request) {
            this.request = request;
        }

        @Override
        public void writeTo(StreamOutput out) throws IOException {
            super.writeTo(out);
            request.writeTo(out);
        }
    }
}
